Over the years, patriarch Jack Martinez has tried a lot of things to build his business at Jack-n-Grill. He's expanded the menu, he's expanded the building, gotten a liquor license, franchised his concept and done everything short of handing out dollar bills to get people in the door. But in truth, he's never really had to do much of anything, because anyone who knows chile knows that Martinez (once a New Mexico chile importer himself) has the best, most consistent supply in Denver of the sweet-hot, smoky southern New Mexico green that defines both that culture and that cuisine. The best thing on Jack-n-Grill's menu is anything with green chile on it, and in season, the faithful line up for a block outside Jack-n-Grill so they can take home a sweating plastic bag of freshly roasted chiles.